Ford SB 289 302 351w Aluminum Complete Serpentine Engine Pulley Kit [Polished] Although the GM heads are

Although the GM heads are good pieces

but both factors can be equally important in a race car

Fits big block Chevy rectangular port cylinder heads on standard deck blocks

They're 40 percent lighter

Speedmaster cylinder head valvetrain kits offer a comprehensive solution for revitalizing your engine's cylinder heads

Ford SB 289 302 351w Aluminum Complete Serpentine Engine Pulley Kit [Polished] Although the GM heads areThe successful formula of offering a complete engine drive accessory kit has now been applied to the Serpentine with Speedmaster pulley systems. Superior engineering, high tech styling, and quality components are combined into a precision machined compact package. Speedmaster pulley systems work with any type of cylinder head or manifold configuration.